You are investigating injuries to students participating in sports, starting with the high incidence of ankle injuries on the basketball team. Observing the team practice jump shots inspires you to try a small calculation. A 50kg student jumps 1m straight up and shoots the .8kg ball at the top of the jump. From the path of the basketball, you estimate the ball left the hand at 30 degrees from the horizontal at 5 m/s. To determine the horizontal forces on the ankle, you decide to calculate the student's horizontal velocity when hitting the ground.

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